package com.weed.helper;


/*
 * $Header: /home/cvs/jakarta-commons/codec/src/java/org/apache/commons/codec/base64/Base64.java,v 1.1 2003/04/25 17:50:56 tobrien Exp $
 * $Revision: 1.1 $
 * $Date: 2003/04/25 17:50:56 $
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "HttpClient", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
 *    from this software without prior written permission. For written
 *    permission, please contact apache@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */



import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

/**
 * <p>Base64 encoder and decoder.</p>
 * <p>
 * This class provides encoding/decoding methods for
 * the Base64 encoding as defined by RFC 2045,
 * N. Freed and N. Borenstein.
 y * RFC 2045: Multipurpose Internet Mail Extensions (MIME)
 * Part One: Format of Internet Message Bodies. Reference
 * 1996. Available at: http://www.ietf.org/rfc/rfc2045.txt
 * </p>
 * @author Jeffrey Rodriguez
 * @version $Revision: 1.1 $ $Date: 2003/04/25 17:50:56 $
 *
 * @deprecated This class has been replaced by
 *             {@link org.apache.commons.codec.binary.Base64}
 */
public final class Base64 {

  protected static final String DEFAULT_CHAR_ENCODING = "ISO-8859-1";
  private static final int BASELENGTH = 255;
  private static final int LOOKUPLENGTH = 64;
  private static final int TWENTYFOURBITGROUP = 24;
  private static final int EIGHTBIT = 8;
  private static final int SIXTEENBIT = 16;
  private static final int SIXBIT = 6;
  private static final int FOURBYTE = 4;
  private static final int SIGN = -128;
  private static final byte PAD = (byte) '=';
  private static final byte[] EMPTY_BYTE_ARRAY = new byte[0];
  private static byte[] base64Alphabet = new byte[BASELENGTH];
  private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

  static {

    for (int i = 0; i < BASELENGTH; i++) {
      base64Alphabet[i] = -1;
    }
    for (int i = 'Z'; i >= 'A'; i--) {
      base64Alphabet[i] = (byte) (i - 'A');
    }
    for (int i = 'z'; i >= 'a'; i--) {
      base64Alphabet[i] = (byte) (i - 'a' + 26);
    }

    for (int i = '9'; i >= '0'; i--) {
      base64Alphabet[i] = (byte) (i - '0' + 52);
    }

    base64Alphabet['+'] = 62;
    base64Alphabet['/'] = 63;

    for (int i = 0; i <= 25; i++) {
      lookUpBase64Alphabet[i] = (byte) ('A' + i);
    }

    for (int i = 26, j = 0; i <= 51; i++, j++) {
      lookUpBase64Alphabet[i] = (byte) ('a' + j);
    }

    for (int i = 52, j = 0; i <= 61; i++, j++) {
      lookUpBase64Alphabet[i] = (byte) ('0' + j);
    }

    lookUpBase64Alphabet[62] = (byte) '+';
    lookUpBase64Alphabet[63] = (byte) '/';

  }

  public static boolean isBase64(String isValidString) {
    return (isBase64(isValidString.getBytes()));
  }

  public static boolean isBase64(byte octect) {
    // Should we ignore white space?
    return (octect == PAD || base64Alphabet[octect] != -1);
  }

  public static boolean isBase64(byte[] arrayOctect) {
    int length = arrayOctect.length;
    if (length == 0) {
      return true;
    }
    for (int i = 0; i < length; i++) {
      if (!Base64.isBase64(arrayOctect[i])) {
        return false;
      }
    }
    return true;
  }

  /**
   * Encodes hex octects into Base64
   *
   * @param binaryData Array containing binaryData
   * @return Base64-encoded array
   */
  public static byte[] encode(byte[] binaryData) {
    if (binaryData == null) {
      binaryData = EMPTY_BYTE_ARRAY;
    }

    int lengthDataBits = binaryData.length * EIGHTBIT;
    int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
    int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
    byte encodedData[] = null;

    if (fewerThan24bits != 0) {
      //data not divisible by 24 bit
      encodedData = new byte[ (numberTriplets + 1) * 4];
    }
    else {
      // 16 or 8 bit
      encodedData = new byte[numberTriplets * 4];
    }

    byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

    int encodedIndex = 0;
    int dataIndex = 0;
    int i = 0;
    for (i = 0; i < numberTriplets; i++) {

      dataIndex = i * 3;
      b1 = binaryData[dataIndex];
      b2 = binaryData[dataIndex + 1];
      b3 = binaryData[dataIndex + 2];

      l = (byte) (b2 & 0x0f);
      k = (byte) (b1 & 0x03);

      encodedIndex = i * 4;
      byte val1 = ( (b1 & SIGN) == 0)
          ? (byte) (b1 >> 2)
          : (byte) ( (b1) >> 2 ^ 0xc0);

      byte val2 = ( (b2 & SIGN) == 0)
          ? (byte) (b2 >> 4)
          : (byte) ( (b2) >> 4 ^ 0xf0);

      byte val3 = ( (b3 & SIGN) == 0)
          ? (byte) (b3 >> 6)
          : (byte) ( (b3) >> 6 ^ 0xfc);

      encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
      encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
      encodedData[encodedIndex + 2] = lookUpBase64Alphabet[ (l << 2) | val3];
      encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];
    }

    // form integral number of 6-bit groups
    dataIndex = i * 3;
    encodedIndex = i * 4;
    if (fewerThan24bits == EIGHTBIT) {
      b1 = binaryData[dataIndex];
      k = (byte) (b1 & 0x03);
      byte val1 = ( (b1 & SIGN) == 0)
          ? (byte) (b1 >> 2)
          : (byte) ( (b1) >> 2 ^ 0xc0);

      encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
      encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
      encodedData[encodedIndex + 2] = PAD;
      encodedData[encodedIndex + 3] = PAD;
    }
    else if (fewerThan24bits == SIXTEENBIT) {
      b1 = binaryData[dataIndex];
      b2 = binaryData[dataIndex + 1];
      l = (byte) (b2 & 0x0f);
      k = (byte) (b1 & 0x03);

      byte val1 = ( (b1 & SIGN) == 0)
          ? (byte) (b1 >> 2)
          : (byte) ( (b1) >> 2 ^ 0xc0);

      byte val2 = ( (b2 & SIGN) == 0)
          ? (byte) (b2 >> 4)
          : (byte) ( (b2) >> 4 ^ 0xf0);

      encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
      encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
      encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
      encodedData[encodedIndex + 3] = PAD;
    }
    return encodedData;
  }

  /**
   * Returns the base64 encoding of String.  First the String is
   * converted to byte[], using the character encoding of
   * <code>ISO-8859-1</code>.
   *
   * @param data String of data to convert
   * @return Base64-encoded String
   */
  public static String encode(String data) {
    try {
      return encode(data, DEFAULT_CHAR_ENCODING);
    }
    catch (UnsupportedEncodingException uee) {
      throw new IllegalStateException(uee.toString());
    }
  }

  /**
   * Returns the base64 encoding of String (by first converting to
   * byte[], using the specified <code>charEncoding</code>).  The
   * return value is also a String.  The Default
   * <code>codeEncoding</chode> is <code>ISO-8859-1</code>.
   *
   * @param data String of data to convert
   * @param charEncoding the character encoding to use when converting
   * a String to a byte[]
   * @return Base64-encoded String
   */
  public static String encode(String data, String charEncoding) throws
      UnsupportedEncodingException {

    // Check arguments
    if (data == null) {
      data = "";
    }
    if (charEncoding == null) {
      charEncoding = DEFAULT_CHAR_ENCODING;
    }

    // Convert to byte[]
    ByteArrayOutputStream bos = new ByteArrayOutputStream();
    OutputStreamWriter osw = new OutputStreamWriter(bos, charEncoding);
    try {
      osw.write(data);
    }
    catch (IOException ioe) {
      throw new RuntimeException(ioe.toString());
    }

    // Encode
    byte[] encodedData = encode(bos.toByteArray());

    // Convert to String
    if (encodedData == null) {
      return "";
    }
    bos = new ByteArrayOutputStream(encodedData.length);
    try {
      bos.write(encodedData);
    }
    catch (IOException ioe) {
      throw new RuntimeException(ioe.toString());
    }

    return bos.toString(charEncoding);
  }

  /**
   * Decodes Base64 data into octects
   *
   * @param binaryData Byte array containing Base64 data
   * @return Array containing decoded data.
   */
  public static byte[] decode(byte[] base64Data) {
    // Should we throw away anything not in base64Data ?

    // handle the edge case, so we don't have to worry about it later
    if (base64Data.length == 0) {
      return EMPTY_BYTE_ARRAY;
    }

    int numberQuadruple = base64Data.length / FOURBYTE;
    byte decodedData[] = null;
    byte b1 = 0, b2 = 0, b3 = 0, b4 = 0, marker0 = 0, marker1 = 0;

    int encodedIndex = 0;
    int dataIndex = 0;
    {
      // this block sizes the output array properly - rlw
      int lastData = base64Data.length;
      // ignore the '=' padding
      while (base64Data[lastData - 1] == PAD) {
        if (--lastData == 0) {
          return EMPTY_BYTE_ARRAY;
        }
      }
      decodedData = new byte[lastData - numberQuadruple];
    }

    for (int i = 0; i < numberQuadruple; i++) {
      dataIndex = i * 4;
      marker0 = base64Data[dataIndex + 2];
      marker1 = base64Data[dataIndex + 3];

      b1 = base64Alphabet[base64Data[dataIndex]];
      b2 = base64Alphabet[base64Data[dataIndex + 1]];

      if (marker0 != PAD && marker1 != PAD) {
        //No PAD e.g 3cQl
        b3 = base64Alphabet[marker0];
        b4 = base64Alphabet[marker1];

        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
        decodedData[encodedIndex +
            1] = (byte) ( ( (b2 & 0xf) << 4) | ( (b3 >> 2) & 0xf));
        decodedData[encodedIndex + 2] = (byte) (b3 << 6 | b4);
      }
      else if (marker0 == PAD) {
        //Two PAD e.g. 3c[Pad][Pad]
        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
      }
      else if (marker1 == PAD) {
        //One PAD e.g. 3cQ[Pad]
        b3 = base64Alphabet[marker0];

        decodedData[encodedIndex] = (byte) (b1 << 2 | b2 >> 4);
        decodedData[encodedIndex +
            1] = (byte) ( ( (b2 & 0xf) << 4) | ( (b3 >> 2) & 0xf));
      }
      encodedIndex += 3;
    }
    return decodedData;
  }

}

